Josh Brent, the Cowboys defensive lineman charged with intoxication manslaughter after his involvement in a car accident that killed his best friend and teammate Jerry Brown, is scheduled for trial on Sept. 23, according to Bloomberg.com.Brent, 25, had a blood-alcohol level more than twice the legal limit in the wake of the Dec. 8 crash in Irving.The intoxication manslaughter charge carries a maximum sentence of 20 years in prison. Brent is free on $100,000 bond and is required to wear an ankle bracelet that monitors his blood alcohol level.Three visit CowboysThe Cowboys dipped their toe in the free agent pool Monday by hosting linebacker Justin Durant and safeties Michael Huff and Will Allen for informational visits, according to sources.But with just $102,000 in space under the 2013 salary cap of $123 million, the Cowboys are doing little more than window shopping.According to a source, the visits should not be considered an indicator that deals are imminent with quarterback Tony Romo or linebacker Anthony Spencer which would lower their cap numbers and create salary room to sign free agents.Nothing has changed regarding those negotiations.But the visits do indicate the Cowboys interest in shoring up positions of concern at some point.The Cowboys have uncertainty at safety where projected starters Barry Church and Matt Johnson are coming off injuries. Johnson had hamstring issues and didnt play in any game or even practice much as a rookie last year. Church tore his Achilles tendon in the seasons third game.Huff, the Irving native and former first-round pick from Texas, was released by the Oakland Raiders last week after eight years.Allen started seven games for the Steelers last year and has 33 career starts. He played under Cowboys new defensive coordinator Monte Kiffin from 2004-08 when they were together in Tampa.Durant played the last two years with the Detroit Lions and started 14 games last year. Clarence E. Hill Jr.Briefly • Patriots: Offensive right tackle Sebastian Vollmer agreed to a four-year contract worth $17 million with another $9 million available in incentives and $8.25 million guaranteed. • Bears: Offensive tackle Jonathan Scott has agreed to a one-year deal to stay in Chicago. • Eagles: Punter Donnie Jones, who spent last season with the Texans, was signed to a one-year contract. The move triggered the release of punter Mat McBriar. • Giants: Left guard Kevin Boothe agreed to a one-year contract to stay in New York. • Falcons: Center Todd McClure is retiring after 13 seasons in Atlanta.